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Mutual authentication with modified message authentication code

  • US 8,260,259 B2
  • Filed: 09/02/2005
  • Issued: 09/04/2012
  • Est. Priority Date: 09/08/2004
  • Status: Active Grant
First Claim
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1. A method of instructing a subscriber identity module in a cellular communications network to process authentication information, comprising:

  • receiving authentication data at the subscriber identity module, said authentication data comprising a first message authentication code (MAC) and an authentication management field (AMF);

    computing a first expected MAC using at least a portion of said authentication data;

    comparing said first expected MAC to said first received MAC;

    computing a second expected MAC;

    comparing said second expected MAC to said first received MAC; and

    processing at least a portion of said AMF in a predefined manner when said second expected MAC and said first received MAC are the same.

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